テキスト暗号化（Caesar/ROT13）
シーザー暗号またはROT13を使用してテキストをエンコードおよびデコードします。
Result will appear here...
About these methods:
- • Caesar Cipher: Shifts each letter by a fixed number (1-25)
- • ROT13: Special case of Caesar Cipher with shift of 13 (used for simple obfuscation)
- • Only alphabetic characters are encrypted; numbers and symbols remain unchanged
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